BASIC TROUBLESHOOTING
48
SYMPTOM POSSIBLE FAULT AND REMEDY
No LCD display If the thermostat is battery powered only, remove the battery
compartment and check to see that the positive (+) and negative (-)
ends of each battery are oriented properly. Also make sure that the
thermostat is securely attached to the subbase with no exposed
gaps.
Thermostat can not Installer Option 03 needs to be set to 0 to provide Heat/Auto/Cool/Off
be set for auto changeover operation or Heat/Auto/Cool/Emergency Heat/Off for heat pumps.
03 = 1 Manual Changeover (Heat/Cool/Off)
03 = 2 Heat Only (Heat/Off)
03 = 3 Cool Only (Cool/Off)
Temperature display Air from wall cavity may be leaking into the rear of the thermostat.
inaccurate Seal hole where wiring enters subbase to prevent air infiltration.
External influence from appliances, lighting or drafts may be affecting
temperature accuracy. Move lamps or other sources of heat away
from thermostat.
Thermostat not displaying Check wiring at outdoor sensor and sensor terminals on subbase.
outdoor temperature Outdoor sensor wires to terminals S2 and SC.
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